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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661fb7891fc30de8a5451ca12f2ff83fc3fae18e9f32342e689275747bdcf6dd' 
  AND token = 'Njkdkb53XR7TqvrQM6tKPlzu0m02Mk9e1ceUvX07kiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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