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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b56662d4d31e4a4ef05ce0e1ea8e9dd9101dea5858e89637f3207726bf3b6d1' 
  AND token = 'z5nikZi3D2mA5X/XxAQzG5KJ1gNjec4ziGFRDAIz8l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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