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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '839f5531ac87e5ff0d5558f8b5e4e27e7d29becd3ef042f5293d7befd7170902' 
  AND token = '5Wngjqpjv+uu7+dOCrFE0HD+Y7Y4yeW/ge+DmhwI4JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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