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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ec71a3f1226cfbee8a919b9196fc1c581792dedaf087f9de77c45d715cd565' 
  AND token = '3su/HeM8wnYQD9qgLi7y9Ub2lh6ZYRULoqk3d5hMs1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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