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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f6ed370efa9d3c758b6a0b9e6eb29e7e12e7d0a35ad1a51fb35b7cefca587e' 
  AND token = 'FnHk8+tThfE9Mqwu6NhVxuaYj0mnqqSgh6RVVZ49Ios=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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