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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42902f7998260625ae709a23f3d630392123fad4fdf4f61fcb20f6f0e04f343a' 
  AND token = 'a0/l21XoYGJ08JZnyBL2E56LbxDWR4mBsC/G6wgX4Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}