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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '610a0abc5700b16d4b669f2e389dddcb47512bb536e9a92259df69b33521eea8' 
  AND token = 'SaTB4C5xFBNyEXZhbwRR0b+vGASokQHQ6gvKbH2+11w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00119

JSON explain

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