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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3270406c31d88ea3fb3b18cf09a1915f6aa967a2484012dd383199a1b0ac83' 
  AND token = 'g0aQTPFHHhud1woWCkGIiVfhHLY6BxfefVsVNkyMf3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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