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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a3274e3ebe0346b7246f5d554ea2c63905f3854cb3b852dfd61a744acc234a' 
  AND token = 'OtJypG7N4LdDRrbHwsmj9nVO9lDF71QS37gHizKM9Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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