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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb4be78aed29c34b67a8f0466948212e69d8481c266925e284bb9cbabea2ce9' 
  AND token = 'XD3k2vevqKBUlDmzZnSREayCtSV53SwAsGq3PtkBuSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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