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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a767497fe1d6046986fbc4baf57f091c86258ae3e98805b157bd7e1ce12c12b4' 
  AND token = 'm0ltIROTIxPryFJ8Xwr1/PFgcqN4ZoX2oWVK96GfTW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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