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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b79a7b308104088617bad53cf22c9a784ff5e0db5433572e588ec4626ccd917' 
  AND token = 'Jpr8IYcZvvVULCZitrLWcIghykdUtdbkMdh/vPN3h9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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