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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c7d2f815d778917a3dfb7d4c5e43d8b0735989c0688a05e9b34fc1f7ed631c7' 
  AND token = '/+yubvYcPSI0Q3otmcLBZJpiRNC8tiL3rc2dkfF2yZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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