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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9db2c9992c9f62b8dc7755ac21298a9ba7cc64ba219014c153fbe2a7cbe830' 
  AND token = 'HbuT/axVPI2vwjO4+nAp30fxr0QT9O1uC2/L/aIG79s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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