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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c12849bee3fa4bca433abfd68772e0df8b71849ce45d90df4085e83bae7c67b' 
  AND token = '3beYTkDU1kquA4MuurZZRavROu8q+znm4ElePybqO54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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