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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d3d8271494e5844b0c15a1352db14be81113a0c9f40affc0a0e21309db9854' 
  AND token = 'wrXs99r9ruMqTaL7uhNqAH2rrmg6e/T8p/yYf4EMRlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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