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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c1f9c42832237b5ff8f588ccd386260d9eaa85e3a1b5d8937c7348d94cd59e' 
  AND token = 'wdTJD321UCfRlmLCYwQe33QrrpDp8IMLBGj7r1YO8cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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