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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aca0e91166772657349418c996e782fbe6531597b8fd8d31832f11fad4b2077' 
  AND token = 'ZnchiMCNw6UbGVc7vBGffz7ZcZy34nW2c6ZJ8D7or+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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