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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335d7f66d208648ddb6ab2a9962c3abf741033549833688aad8eb792091840a0' 
  AND token = '1XFG+nNW51yGJZVNXJ+aaRDpoWF/OxkX911X8eLzEqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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