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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9a52d2be56489d667e2a3ddf73b2a2bdb64ef7f6d9e436f316268a98e70baa' 
  AND token = 'lWbQiSpxDz6XZ6I2nf6ybmh5w/ZSNapEjnkncRWZ7pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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