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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c890af372454a6b1a6b7bebf65ec6c2b5d6be96632dfffd29a7391a3c1a95ab2' 
  AND token = 'EVWxn8Gs/9zqZNcy0QM4RuI9unVlt34Um5dySfnagZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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