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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5411a7d556a38c4c17d30c64636f04ae14d394f22c636a621261b7fd9551c943' 
  AND token = 'ECAa0HgGr3fbORuj2ccOGBTE/uf57F+LFIbfszxisac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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