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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce1f8a0193cfd844c1bce0ed306a7426a7fa07db83ba917340e212a3f6f8423' 
  AND token = 'GlAV7kXNUMnbGtOccxjeeIpTuxMjMQpBQhfD5KJphMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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