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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47ccb58ccc3c3c0985f819d2e5110bb540b752948d306ec56a373ea43a26428' 
  AND token = 'oTlq+jKfBz5ni7GIZaORxO26SQgIGreoXoYRT4t9/Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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