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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609e2032d45de1741d19adffaa4f0926fe4e1143b294c12bed0bbe8e86568712' 
  AND token = 'Kkna4jNqJJEmxpB6eAwauJOtrcKk71e5+VT+F+y7dtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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