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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9820dd593a0f03100febf55a7a3667ab011a30dda4d48c5210dcdecdba595e66' 
  AND token = '8w8rHf2K7SCCjc45k0G9+sakjHiG/Oit3dvSf0771oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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