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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f2a502387a539ac6907f1e948a23e7c89f8a5d437a8413dc3b7c593967c53c' 
  AND token = 'pFORkrJjVm5rGX9K4XHdbndksRWNKJQPAn1ICuVj6ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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