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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dccaf4c43062f42c00c4ffc53b6e52deb9d97117a35e6649225e70f7c73714a' 
  AND token = 'o3WCpBU5CY46nNDbuCAf4wC31mxzVx27nVuAJfKh31Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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