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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9430645c93ec5068cb9e16ecba8a57b53df4350b1e162ac9920b7babf48e7506' 
  AND token = 'x5fg0hzD3WnstOC2opfHnlIlRkzS8t4TxQPhEoM/QN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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