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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33e7dd6fa8b684b169cba1c7a11daedb2a645d3e34947e16d60c300b4a8bf76f' 
  AND token = 'zuTubNB7L05t+I7CovNBcXYB+47639o7ukJvc9cSDB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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