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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b00d7aa06258a443ecb66f7bd8f7ccdd869b08f62f2107bfe506f0c50f07dd5' 
  AND token = 'HwEuP8CH73yFqdPYsb/oTG79ezbZLwmvxP9BAYQfeko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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