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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb69dab30d1488eef4a75c26c434b37975cc5f83ae5d465daf97f764e0ca516' 
  AND token = 'qA0cJNlhe/uQ38DxgSgCrzdJ55sfXET7ANBA7GvTxTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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