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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32675a41ad527b307a855900122a33f978562ca2642c7b72f9b2459fe5cfe038' 
  AND token = 'fJSyJx9IL2NhP9l/3C/P3YcjXblvveJliVN61x+OvPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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