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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f3e96f34ef74dfaeb1e7c80371322066fae5fbe317eb404fb67e1ee9308dcd' 
  AND token = 'VPm42Q0IJiMzRf/+c5+E6EzVbmxiwEa+Bq1CJ4z18AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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