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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6037ba0d05ed0c2f53061c65780a47f3e7411ea354c205944f65c6476dfe55d1' 
  AND token = '/ROddr+QJqFJ+KUtZb1w0kcR68ZKC04IgUrRQ9M3eag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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