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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9d94e638215690b8fb2d884d67243878ac6561ee2ac6133bce24cc65e2bf47' 
  AND token = '/jfaUCSBhr8/uckIcMgXX74klEuxx0Cz8eQjjTtHvpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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