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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b632ea0edc54c603e7084884175dbd6fe115b368b5fb6f72681756806a51bcee' 
  AND token = 'Tzq+NFSMXBofP05MndYBp8CQSpMKgX8/tWJdr4v7Rus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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