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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868769f2ccd7feb6c07949c9c2fccbfbda5681367c3eab69e04a349363d7881f' 
  AND token = 'iKOz84YBNEciwISU0zSiumaoQB78rMPCuH+OHn0vg+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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