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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ab0d04599fc23ae0c3a8e412ca1e4434fc99d4cf5e6f942da13fba68426512' 
  AND token = 'DRSfMC/TlAlxVH7OiBBjshwFFDbB/ql+MBLNdH5PSFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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