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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb631b6f4a34105aca41b6b7ea40e0420940728150c8e8c9f0920145be228d8' 
  AND token = 'Tp6zIR8AKN5Tn+tlHgihbPhVRQaPeMVMuLk/702Hk/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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