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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb192947eed862e0ab6dd86ea3d742c09b39cbe64b1db41de99d04f802f3b8b' 
  AND token = '/k626bi021konOLnYmZWM4lkMqwZgjbufjQTzp/Xb58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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