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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da393f8c6c1ab7f48792de0f90f81be596fe23753788eb308b287359c03ef81b' 
  AND token = '1sLvcwkrxeVj8qPirUeM32oT6JBvV80H/Wv5UomOfxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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