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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a49a144d5ed4b69118f50860d6aee5bc5258f006c057d2f27f645ef857842f' 
  AND token = '3mP+WbJZCzc6ncQx37cuVk9ZJLJaGD0D3C2/qL2i/Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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