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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110da770e3137435ab5fd6c616acd147fa018e36215a71ba96dcde9f05a2f61d' 
  AND token = 'peW/GzgibRjQeE6CAZ0raEJYyGN05xtxzRo47UNt4sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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