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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e9d4cdc4afe4d9cb21f321177cac0cfa6ad72756fa6f49f469ff3b1713ee22' 
  AND token = 'u9DokdqoNhvicYGGWXQeWeE2aGmH7prSVIJg3yubwXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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