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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc4bdc02b43f9b18f93cb1c8295649c4688d3c9861367c236d74ddc39f71ac3' 
  AND token = '/nuQlXA6+JycSrO/Xz+qhCctbbVd2VqvC24N9ixFSm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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