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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dfabb0747dcaf8a3cf9c7ff1e303c8a2bf8f57cd0bbbb8b7853d12e1ce98126' 
  AND token = 'HtDP8pU2Lrw/0Ux9GIeJBJ1SvKp7fPHJahxGksyEPpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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