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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a84935d6b27741438ba145dc6ea12bfeecf74e07c8d2dfa9cbba5b1eabef637' 
  AND token = 's5mt4lvALOAfU48VPI789/rs4IcUD17bR2K5Dyt97oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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