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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a70645eb08f0aa6f293697bcabc9171496a57cadac0c5e1d7d15b308ec6e393' 
  AND token = 'taTyNHe1WS7us7McyAEUhhE8xH/dC3K6Tz5uMrDM85o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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