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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8996652e92a5e71e2fa8155fc37972abdc2b244b286fa83b22c8a411005129f' 
  AND token = 'ehffQBQzlI6RUf9lbtEGgaLoWAmmBbP9jHFv8g800Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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