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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9490e9c125cae0f3ac23d67977c4afb4e9671e216ae26bcdc340aa0e57921ed' 
  AND token = 'M4HX6EKOMUKCZxhSShE+D7TV0jxHXpGBa1r9wGka2No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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