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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c856667cb3c08bd3cfe4f984abaeaa0ad8536b0d603a82b11a99cd038aa99de9' 
  AND token = 'COQUk5d1nX9P/lo9ZR63eKq+ZFpvjp+XnayUqz5/Kjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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