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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939dc03f6d0a091cd4807747886ae8134d602464aacc721138860f345e321e04' 
  AND token = 'sqQXtQd6yYwy/PIUXL3aODd6ogYgV4Y2Nek2T161erg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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