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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177b1408c51e0e6afbe01187b5acf45815c10e2ae43fbad611e74309e1a68cc5' 
  AND token = '0obYlyVxpmfQxzGQjiK6dV9ang+KcrLhGyMMChquI7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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