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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4110b897731db99b065bd7acfdc23e99a11db26a5333c042d9edb18b2912d0' 
  AND token = 'Rsm7jAHf1MdUVYu+0tvpv+Rt94V8fJ5V5qoq6uOUqdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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