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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b8bd716798d5a5ed7bc3190f1ed71ed679ff0e1bb785769ac9e563265297c6' 
  AND token = 'rXxSx+eQm3RZ9BF3OrUBaF32LuAnrU8sdgYDbchynEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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