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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a45a126db5a0eb5e2389bd5010871206d9e4df1c2e90e1c410518677f1dd5d' 
  AND token = 'w6Eawq41Mc5fhxGIvDJnyNylAy4guYXdoqIYTrIbuQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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