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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79c4c11232d74eafe4d6d8d444cf2e222a978a44567e932221f139674423e84' 
  AND token = 'L6ETGlJ0Ai7KIrKwJ2dWj2s39YuJSq4ooJ7FJOV1UB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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