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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1afca6d10746d6bd80934f39debaaa3ea1fff74340877ba0721b245e46f59678' 
  AND token = 'jLmClZzgFdWIOPAEQkwismInf5jrnclyR82VjPsDcbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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