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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '491bf5259974c64b85ac4c74fe062cbb66a31e5cad00836e1de444941ef79ee3' 
  AND token = '9g9zzgPNfyZZheN+/rU8hCwKYV0LN8zeUxrpFDZSxco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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