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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd1849113a6ade2cebe312e724637224570bdb2dccded8280fd4e1d4191b672' 
  AND token = '0KQkbnGnxs+TZ0QV0y6nhpDnrxoXy13ARFNgAuScEnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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