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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6655d6f44a8bd7acf9295b6db2fcadf9aa97694115798a55e86be3c276238172' 
  AND token = 'rr0kR8dcn3AojSGdNXm+V81dT53LeQ5Che9vJo5YLBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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