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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c13a39dea59cd5f00e67743265805ec7337897bae87c9913b1f5075994f07b' 
  AND token = '7sC6MT63zW+h8BxiS8CbO1p0wl/rEIx2RNAvTP3GYME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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