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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e8f18f5aa9a6a9f4c993073bf30bfe12230be1499fb8d7d7a1aa01a0a926a43' 
  AND token = 'eBN/nb6K7gIg5yEoIp1jJrQBcEi5UUkjsC7M8XZ7Hc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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