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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58995d415d7220c9afaeee8fef5869b78a265b9f0ea3ccea0316eaacd7f55709' 
  AND token = '0k2LOCK8EIsEZlzXRagJ+ailFh52gysE/tsKSItoOjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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