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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6bb56aa014e71cb181d5750bca9fc85dec56a740ca2e52233439b34ea20dc0' 
  AND token = '8KyVqR4ej7CXpSu6t8vCL9ca8ROjPN9zfU8SXsrG5/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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