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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac87520ea86d815d0cbfaa9145cd7453a4415df37ebe0c78ee4363d409bc0b5' 
  AND token = '97vBNtupKO4BTrPVNSI9bofivEjwDBEGNoM0SlPP1pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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