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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7923bf39dad0596dd6a1f1b5c3a9e55221b28b5e04dd72556aa313d6bf37749' 
  AND token = 'Z6UZRliso82N+O/JV9X672RUof4XxUashvBDXDKhMSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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