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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2693b78d5430ed74bd77b570b4f8ed7bdc858a2f3f3b885d6d247f8480ac37' 
  AND token = 'ZRXEuGsS5Q1CHJrCGjdRreGkYonyZBrTYyHRq9GVeWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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