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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9bffe54a14a43718c555654e20ad3a069884c9ce6eaf58d3c5b80b35e2ec8a' 
  AND token = '6tiuNcmqFhpOR/7lDncNbGTjfjyZJpqbK/DnN0/XLnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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