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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee59f7e2e9b737b0ba305faf4c1325cd5d58c510b43ae4bfe85e2f041eae4fe' 
  AND token = 'jPsPPSk8kEq29v1tSc3i7gaIgeNeHolmNdh7K6v7dvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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