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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56952d782136caf7e3ec29c54de13f9acc65d1b269c3d1c8eed82ff35be67b82' 
  AND token = '3vyTSJeV7nOZ6d7/vBloHlRIe97WI7R41HARyrdRv6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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