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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e185e4f1633d36ee7d6b2165ee95db9bfb9b7b399d2c0bdc106cafd599a9bf' 
  AND token = 'KQ8z9XjfhEunzFzHOVRx9kh4kRkLuYwXdl9hO2o5POg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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