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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '728efd5ead1a05709f37b967b0f80e574644fe1c3bcf103396ec1b2cf3224d31' 
  AND token = 'lxx72zf3r8yDTbdqNWfSnD95fDMVMObv+o9btaT/eAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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