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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f4bcd484667dd9479f2e2d9d5d3f05108f342189efdae0ee0e5038e52605ff' 
  AND token = 'JGBjz3azqnAMXByi1L8LO54LXQq+43Uwe7EgJIigVkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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