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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e4de129ed5939f9848b352be30ae77e73f01cc5d3459abc6b89d7f6de1d3cb0' 
  AND token = 'kFaNZG05lpWdLNsueEt3me/C8AzpabwDQnw8aKn/dOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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