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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f8b6f9faa536ec39d77f4f5a615c177f31b3f01764f80856a0a6b388a8cd79' 
  AND token = 'kyGbNATwoL7TaZH42MXPwVTdf/Jf2jFGPu6kJJQIUBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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