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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a4d263da9d196be1cc5e6b8246bc198ff9e5c99782b668dd88c173b6d9cb7eb' 
  AND token = 'BSh0uFh53wr/Vcyjdz2F8rAvd/jlCI5E9mlXflpqKsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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