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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e254cf13a930ed7950b74afc3ba9f818989889ba4812349d56ca6d3fa02bc1b' 
  AND token = 'EXpnq85kXttRnbM9kXA3lqBUTm3qyNJatkSySQfS/G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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